Numerical simulation of friction torque of rotating disc for rotor-stator system with central inflow

In order to investigate the friction torque performance of rotating disc for rotor-stator system with central inflow, numerical simulation was conducted by using computational fluid dynamic (CFD) commercial software CFX in consideration of flow parameters and geometric structure respectively. A test rig for the friction torque of rotating disc was developed to test the friction torque of free disc. The numerical simulation results were compared with the previous empirical associated correlation for the friction torque of rotating disc for rotor-stator system with central inflow. The results show that compared with the previous empirical associated correlation, the difference of dimensionless the moment coefficient is within 10%. It is convenient to use turbulent parameter which represents the rotating speed and superimposed flow to analyze the friction torque of the rotating disc. For a given value of the turbulence parameter, the magnitudes of the rotating speed and superimposed flow have effect on the friction torque. Compared with the flow parameters, geometric parameters have smaller influence on friction torque.